1. A mode or state of being: "The Organization Man survives as a modern classic because it captures a permanent part of our social condition" (Robert J. Samuelson).

2. a. A state of health. b. A state of readiness or physical fitness. See synonyms at state.

3. A disease or physical ailment: a heart condition.

4. Social position; rank.

5. One that is indispensable to the appearance or occurrence of another; prerequisite: Compatibility is a condition of a successful marriage.

6. One that restricts or modifies another; a qualification.

7. conditions Existing circumstances: Conditions in the office made concentration impossible.

8. Grammar. The dependent clause of a conditional sentence.

9. Logic. A proposition on which another proposition depends; the antecedent of a conditional proposition.

10. Law. a. A provision making the effect of a legal instrument contingent on the occurrence of an uncertain future event. b. The event itself.

11. An unsatisfactory grade given to a student, serving notice that deficiencies can be made up by the completion of additional work.

12. Obsolete. Disposition; temperament.

1. To make dependent on a condition or conditions.

2. To stipulate as a condition.

3. To render fit for work or use.

4. To accustom (oneself or another) to; adapt: had to condition herself to long hours of hard work; conditioned the troops to marches at high altitudes.

5. To air-condition.

6. To give the unsatisfactory grade of condition to.

7. Psychology. To cause an organism to respond in a specific manner to a conditioned stimulus in the absence of an unconditioned stimulus.

8. To replace moisture or oils in (hair, for example) by use of a therapeutic product.